Hibbard t



(No Model.)

H. T. BOWEN.

BORING MACHINE.

No. 288,403. Patented Nov.- 13, 1883.

WlTNESSESf l Eb lTOR: I

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4 ATTORNEY.

N- PETERS. Piwlomhngrzphar, Washington, D C.

specification and UNITED STATES PATE T OFFICE.

HIBBARDT. BOWEN, or PHILADELPHIA, PENNSYLVANIA, ASSIGNOR or ONE-HALF TO PHILEMON P. PowLns, or SAME PLACE.

BORING-MACHINE. j

PECIFIGATION forming part of Letters Patent No. 288,403, dated November 13, 1883.

Application filed April 21', 1883; (So model.) i

.2 all whom it may concern.-

, Be it known that I, HIBBARD T. BOWEN, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Boring-Machines, which improvement is fully set forth in the following accompanying drawings, in which l Figure 1 is a side elevation of a boring-machine embodying my invention; Fig. 2 is a a horizontal section in line a: m, Fig. 1. Fig. 3 V is an end view thereof.

Similar letters of reference indicate corresponding parts in the several figures.

It also consists of means for adjusting the parts of the frame.

It also consists of means for automatically returning or withdrawing the boring-bit, as will be hereinafter set forth.

Referring to the drawings, A represents the frame of the machine, the same being of rightangular form, consisting of the upright portion A and horizontal portionor base A. The

upright portion A isbent or of inverted-U shape, and formed of metallic tubing. The base A. is bent or U shape, resting on both limbs, and likewise formed of metallic tubing,

the limbs entering bosses a, formed on the lower ends of the limbs of the upright portion A, it being noticed that the upright portion may be moved on the base for the purpose of adjusting the position of the boring-bit relatively to the work to be accomplished, the

same being connected with said upright portion, each portion being a single piece of tubgrooved, and journaled to a Verticallysliding head, 0, whose ends are fitted to the limbs of the upright portion. of the frame, the upper end of the stock carrying a bevel-pinion, b, with which meshes a bevel-pinion, c, the lat ter being connected with the driving or crank shaft, (2, the bearings whereof are on the'head G. On the bit-stock is fitted a vertically-adjustable collar, D, which is set relatively to the depth of y the hole to be bored; and to the upright portion of the frame, between its ends, is secured a cross-head, E,which has a central opening for the passageof the bitstock. In said cross-head E, adjacent to the bit-stock, is also a vertical recess, e, in which is fitted a key, F, which is so located that its head is adapted to be engaged by the collar D on the bit-stock. In order to hold the key in an elevated position, aspring, G, is employed, the same resting on the cross-head and bearing upwardly against the key. The outer side of the recess 6 is oblique, and the contiguous side of the key is correspondingly shaped, whereby, when the key is elevated, its nose or point f is entirely clear of the spiral groove of the bit-stock. When the collar D is adjusted, the crank-shaft d is rotated, and the boring 'is accomplished, as usual, to the limit of the collar. As soon as the collar reaches the key F it depresses the same and moves it against the bit-stock, whereby the nosef engages with the spiral groove thereof,

and the'bit-stock, with connected mechanism,

action of the spring G entirely clear of the bit- -stock, whereby the advance or boring action of the bit may be continued.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- V 1 In a boring machine, a right-angular frame formed of an upright U-shaped limb and a horizontal U-shaped limb connected therewith, each limb being a single piece of bent tubing, substantially as and for the purpose set forth.

2. Aboring-maehine frame formed of an up- 5 right U-shaped tubular portion and a horizontal U shaped tubular portion, the upright portion having at its lower ends bosses, through which are passed the limbs of the horizontal portion, said bosses and limbs being perforated for the passage of fastening-pins, substantially as and for the purpose set forth.

3. In a boringmaehine, a spirally-grooved bit-stock and a collar connected therewith, in combination with a key having a nose, and a spring bearing upwardly against said key, I 5 the frame of the machine having a cross-bar, which supports the spring, and is formed with an oblique recess, in which said key is fitted, substantially as and for the purpose set forth.

H. 'l. BOWEN. 

